Because the Java extentions are SoapExtentions they need to be copied to the ext directory.  To do that, run the following:
su - zimbra
zmzimletctl deploy ca_greenrope.zip
exit # (run as root)
mkdir -p /opt/zimbra/lib/ext/greenrope/
cd /opt/zimbra/lib/ext/greenrope/
rm gr.jar commons-lang3-3.1.jar # Remove old copies if needed.
ln -s /opt/zimbra/jetty/webapps/zimlet/WEB-INF/lib/gr.jar
ln -s /opt/zimbra/jetty/webapps/zimlet/WEB-INF/lib/commons-lang3-3.1.jar
su - zimbra
zmmailboxdctl restart

